<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>结构化标签</title>
</head>
<body>
    <!-- 传统写法 -->
     <div class="header">页面头部</div>
     <div class="nav">导航栏</div>
     <div class="section">主体内容</div>
     <div class="aside">侧边栏</div>
     <div class="footer">尾页</div>
     <hr>
     <!-- 结构化标签写法 -->
      <header>页面头部</header>
      <nav>导航栏</nav>
      <section>
        主体内容
        <article>第一篇……</article>
        <article>第二篇……</article>
      </section>
      <aside>侧边栏</aside>
      <footer>尾页</footer>

</body>
</html>